Rotary field-magnet with two poles.



P. LJUNGSTRO'M. ROTARY FIELD MAGNET WITH TWO POLBS.

APPLICATION FILED JAN. 24, 19 14.

1,1 15,220. Patehted Oct. 27, 1914.

3 SHEETS-SHEET 1.

I. LJUNGSTRUM. ROTARY FIELD MAGNET WITH vTWO- POLES.

APPLICATION FILED JAN. 24, 1914.

1,1 1 5,229 Patented Oct. 27, 1914.

3 SHEBTSSHEET 2.

In van/Z07 P. LJUNGSTRUM.

ROTARY FIELD MAGNET WITH TWO POLES.

APPLICATION IILED JAN. 24, 1314.

1,115,220. I Patented 0013221914.

3 SHEETS-SHEET 8.

Qt Z011 722/1515 as i ran FREDBIK LJUNGSTREM, 6E FEET-SP5 circa re asirrsnoraee'r rennescram:

.Applicati on filled Jnery as, 29

To all whom it may concern Be it known that l, Farmers. lia'unesrnoai,

and a citizen oi bweden, residing Fmspang, in the Kingdom of Sweden, have invented certain new and useful improvements in Rotary Field-Magnets With Two Foles, which the following is a specification;

The invention relates to rotary field cagnets with two poles, the exciting of which consists of frameshaped copper plates, which are connected with the pole core. According to the invention these frames are connected "with the core along their entire length. For this purpose the frames are provided with dovetail-shaped or similar recesses, which engage corresponding projections on the pole cores er ribs or the like, attached to said ccres.

Several embodiments of the invention are shown in the accompanying drawing.

Figure 1 shows a field magnet embodying my invention in end elevation partly in section. Fig. 2 shows said magnet in side elevation partly in section. Fig. 3 is a section on the line l-1 in Fig. Fig. shows a field magnet with detachable pole shoes or pole pieces. Fig. 5 shows a winding, composed of two frames. Figs. 6-1l represent different forms of the securing parts, while Figs. 1216 show difi'erent positions and forms of the abutting ends of the frame parts. Figs. 17 and 18 finally show a further embodiment of the securing device.

In Figs. 1 2 and 3 a indicates the field magnet which is made in one piece, and 6 indicates its exciting winding, which according to Fig. 3 is composed of "Ll-shaped frame-parts. These latter are connected in series and their ends can either, as shown in Fig. 3, engage each other by means of dovetail-shaped projections, or, as shown in Fig. 5, only be pressed against each other and eventually be soldered together. Each U-shaped frame part is connected as above at one end to a corresponding end of the similar frame part next below it and at its other end to a corresponding end of the similar frame part next above it, the entire series of such frame parts thus making a continuous helical winding about the core. They are readily applied thereto and removed therefrom. They are of course insulated from each other except at such terminal points of contact. As shownin Fi Specification cfii'ietters Patent.

(2', whereby a cooling effect is increased by mean Til 0 P01111353.

Fatented @ct. 2Q, rare.

Serial No. 5 1

' :3, their ends in contact. may be beveled to i engineer, a sub ect of the King o weden, I

t together along a considerable surface 'ithout any increase of thickness in this part. Alec, when abutting or overlapping joints are made, whether with or without dovetailed connection, the joints of successive layers of the winding may be arranged vertically above each other as in Fig. 12, or may break joints in regular overlapping suc cession, as in Fig. 16, or may have any convenient irregular arrangement as in 15. course electrical conductors connect with the first and last frame parts of the series. 0, indicates end parts, which are connected with the pole shoes and with the shaft carrying pieces which cause aneffective h the space between a, c cooling of the l g is obtained. This s Oi ducting plates on (Fig. 8), which cause the ilow of air throng air to flow immediately above the ends of the winding. The parts of the winding are inserted in such a manner, that they tightly engage the inner surfaces or" the polepieces. As shown in Fig. 4 the parts of the core adjacent to the pole pieces are not provided with tongues orprojections. The other part or" the core is, however, provided with ribshaped tongues or projections g, which, ac cording to Fig. 3, are dovetail-shaped and in the end parts 6 there are slots 6 and holes 1 which. cociperate with the corresponding tongues or projections h of the winding 3). lVhn each winding part has been placed upon the core it is moved along the core, until it engages the insulation of the winding part, previously inserted. Between the winding and the core an insulation is must of course be inserted. The whole winding is effectively pressed together by wedges f. To prevent theinsulation or the winding from being damaged by the insertion of the wedges, special covering plates are placed below the wedges. The wedges are attached in suitable manner, preferably by means of special securing means of round or any other suit able shape, inserted between the wedges and the pole pieces. The shape of the covering plate corresponds usually with that of the winding parts. In this way the winding parts are. secured in place directly by the projections, engaging each other. The projections it according to Fig. 7 are not plane but arched (compare Fig. 8) and are planed after having been inserted between the projections g of the core. Hereby the two parts abut effectively against each other. In order to obtain a good contact the abutting ends of the winding parts can be given different forms.

Fig. 12 shows an embodiment, in which .each winding consists of two parts I) and b, which abut each-other. The ends of these parts are step-shaped.

According to Fig. 13 the ends of the winding parts are obliquely cut, z. e. Wedgeshaped, whereby a. good contact surface is obtained without soldering. The insulation between the winding parts can be inserted in the same way as said parts and have the same or similar form as these latter. In order to increase the strength of the Winding and its capacity of resisting the great strains, to Which it is subjected, the joints in Fig. 12 can be arranged in zig-zag as shown in Figs. 14-16.

Figs. 17 and 18,finally show, how the pole core and the exciting winding are secured together by means of special ribs Z or the like. The core and the frame parts of the winding are provided with corresponding interlocking series of integral dovetalled pro jections as shown in Fig. 17 The ribs of the winding support may have a common base, as in Fig. 17, or separate bases, as in Fig. 18, these bases collectively making up the collective base of the ribs. Any ordinary method of fastening may be employed.

Having thus fully described and ascertained the nature of my said invention, what I claim and desire to secure by Letters Patent is l. A'winding consisting of U-shaped frame parts connected electrically end to end in a helical series in combination with amagnet core having dovetailed engagement directly with said frame parts.

2. Awinding consisting of U-shaped frame parts connected bydovetails end to end in a helical series, in combination with a magnet core having dovetailed engagement directly FREDRIK LJ UN GSTROM.

WVitnesses Vroo HANSEN, OSCAR Enosrnom. 

